Java writer class

Java writer class

Tutorial below is regarding Java writer class. Java writer class is an abstractly
implemented idea for writing text files using character streams. It is defined inside
java.io package. This class is the root of all
the classes that write character output streams. In short, writer class provides
foundation for the classes that write character output streams. This java writer
hierarchy contains many classes such as PrintWriter, BufferedWriter,
FileWriter,
OutputStreamWriter and many more.

Diagram below demonstrates a subset of the Writer
hierarchy. Diagram demonstrates the classes that are used to create an OutputStream
environment of characters for writing text files.

Class PrintWriter defined inside the abstract class writer, writes or has
function defined to put the data (characters) into the character output
stream. Similarly class BufferedWriter creates a temporary memory called buffer
for the character output stream so that the stream values that are the actually
the characters, can be processed more efficiently. Class FileWriter interconnects
the character output stream to the path of a file. Class OutputStream Writer creates interface (like a bridge as connector) from a character output stream to a binary
stream.

Note: Al l data is stored as text characters
with one character per byte on disk.

A Stream is the flow of data from one location to another and an output
stream is the flow of data as characters from the internal memory of an
application to a disk file. With writer classes data as text are written
on text files.

Stream to get its functionality requires layering in which two or more streams
are layered and forms a filtered stream. This filtered stream now possess all
the functionality to perform either Input or Output operation.

While working with writer classes following three
different types of exceptions are often generated.

IOException:- Is thrown when an error occurs during I/O
processing.

EOFException:- Is thrown when the program control attempts to
read beyond the end of the file.

FileNotFoundException :- Is thrown when the program control
attempts to open a file that does not exists .

All the above exceptions can be handled with try and catch blocks. Also can be
avoided by using throws keyword.